<fieldset>
<?php $form = $this->form; ?>
<?php $form->prepare(); ?>
<?php echo $this->form()->openTag($form) ?>

    <div >
        <?php echo $this->formLabel($form->get('email')); ?>
        <div class="form-group" >
            <?php echo $this->formElement($form->get('email')); ?>
            <?php echo $this->formElementErrors($form->get('email')); ?>
        </div>
    </div>

    <div >
        <?php echo $this->formLabel($form->get('password')); ?>
        <div class="form-group">
            <?php echo $this->formElement($form->get('password')); ?>
            <?php echo $this->formElementErrors($form->get('password')); ?>
        </div>
    </div>
    <div >
        <div >
         <a href="javascript:void(0)" class="btn btn-lg btn-success btn-block" onclick="login()">Login</a>

        </div>
    </div>

<?php echo $this->form()->closeTag() ?>
</fieldset>